Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block – Surface modified glass
Patent
1978-09-28
1980-04-15
Robinson, Ellis P.
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
Surface modified glass
428432, 428433, 428539, 428900, B32B 1706
Patent
active
041984676
ABSTRACT:
This invention is concerned with the production of transparent glass articles having compositions in the Li.sub.2 O and/or Na.sub.2 O-FeO-Al.sub.2 O.sub.3 -SiO.sub.2 field which additionally contain NiO and/or CoO. Upon exposure to a specifically-defined heat treatment in an oxidizing atmosphere, very fine-grained crystallites of NiFe.sub.2 O.sub.4, CoFe.sub.2 O.sub.4, or (Co,Ni)Fe.sub.2 O.sub.4 are formed spontaneously at the surface of the glass article to produce an integral surface layer thereon having a thickness of not more than about several thousand angstroms. These ferrite surfaces can be magnetized in a strong magnetic field and are relatively easily demagnetized. Such capabilities recommend these surface-crystallized glasses for applications in the storing, recording, retrieving, and erasing of information.
REFERENCES:
patent: 2920971 (1970-01-01), Stookey
patent: 3940531 (1976-02-01), Demarest
patent: 3962514 (1976-06-01), Rittle
patent: 4059454 (1977-11-01), Reade
patent: 4083709 (1978-04-01), Reade
Corning Glass Works
Janes Jr. Clinton S.
Robinson Ellis P.
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